action regular is usually the darker, high pulse stuff. Like a Bebop techno video or just about any FLCL video ^.~ Action upbeat is more for dance-ish stuff, where's there's plenty of action sync, but it's more a dance to the music or just a song that gets one tapping their foot (read: Odorikuruu).

"With free bagels we can live like Kings!...Kings who have to pay for their own castle in order to get the free bagels!" - Omar Jenkins